Can someone please tell me the models currently manufactured by Conway Stewart? Excluding LEs.

Richard Binder's website has the basic models nicely described and compared side by side:
http://www.richardspens.com/?page=sales/newp_cny.htm
just scroll down the page to see it all; size comparisons are on the very bottom

Thanks for the link. Looking at the sizes of the CS pens alongside (for example) the Pelikan M800, it's clear just how *big* the Nelson, Wellington and Churchill are. I don't think I'd want to go bigger than Duro size for normal use.

I wouldn't go beyond the Duro for everyday use either. In terms of size, the Duro and Parker Centennial are pretty evenly matched. Whilst I was at the Midlands Show I tried out a Churchill and yes, there's no denying it's a BIG pen, but I was surprised how comfortable it actually felt even to me and I'm a very petite 5'2" so as you can imagine, I certainly don't have huge hands. It's not a pen I would ever choose to own, but it did surprise me that I was actually able to write with such a large pen.

The Churchill is very light for its size, so quite 'manageable', while some others, like the Nelson, and the Wellington which I have, are a bit smaller but heavier...look at Richard's figures for the various weights.
(I think they were making cannons when they built the Nelsons!!)